甘肃省金昌市黄草窑石灰岩矿地质特征及矿床成因

Geological Characteristics and Deposit Genersis of Huangcaoyao Limestone Deposit in Jinchang City,Gansu Province

黄草窑石灰岩矿位于阿拉善地块西南缘,南邻祁连山摺皱过渡带,矿体主要赋存于韩母山组上岩组(Zbh2)碳酸盐岩地层中。本文通过该地区地质勘查成果资料及野外现场工作的基础上,对矿床地质特征、矿石质量、沉积环境及找矿远景进行了研究分析,结果表明该区石灰岩矿床化学质量稳定,内部结构简单,是优质的电石、水泥原料n矿石具中厚-厚层状构造,微晶结构,围岩蚀变主要为轻微硅化、白云石化。矿体向NW方向延伸趋势明显,具有良好的资源远景潜力。

Huangcaoyao limestone deposit is located in the southwest of Alasum block,adjacent to the fold transition zone of southern Qilian Mountain,and the ore bodies are mainly occurred in the carbonate formation of the Hanmushan Group(Zbh1234).Basing on the geological exploration information and field work in this area,this article studies the geological characteristics,ore quality,sedimentary environment and exploration prospect,the result shows that limestone deposits with stable chemical quality and simple inner structures in this area are good raw materials of calcium carbide and cement.Ore has a stratified structure with medium-normal thickness and a microcrystalline structure,and the wall rock alteration mainly consists of slight silicidation and dolomization.Ore body within the deposit shows a clear extension toward northwest,having a fine potential of resource prospecting.